Contingencies, tax uncertainties and commitments - Additional Information (Detail) - Dec. 31, 2025 £ in Millions, R$ in Millions |
BRL (R$) |
GBP (£) |
|---|---|---|
| Disclosure of Contingencies Other Liabilities and Commitments [Line Items] | ||
| Uncertain tax position total potential exposure | R$ 92 | £ 12 |
| Current Brazil [Member] | ||
| Disclosure of Contingencies Other Liabilities and Commitments [Line Items] | ||
| Uncertain tax position total potential exposure | R$ 1,423 | £ 193 |